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rootn: Use denormal path only

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It's OK to either flush to 0 or return denormal result if the device
does not support denormals. See sec 7.2 and 7.5.3 of OCL specs
Use 0.0f explicitly intead of relying on GPU to flush it.
Fixes CTS on carrizo and turks

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Acked-by: Aaron Watry <awatry@gmail.com>
Tested-by: Aaron Watry <awatry@gmail.com>
llvm-svn: 332324
This commit is contained in:
Jan Vesely 2018-05-15 04:22:43 +00:00
parent 93bce5108b
commit 58fdb3b09a
1 changed files with 1 additions and 10 deletions
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11
libclc/generic/lib/math/clc_rootn.cl
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@ -170,16 +170,7 @@ _CLC_DEF _CLC_OVERLOAD float __clc_rootn(float x, int ny)
tv = USE_TABLE(exp_tbl_ep, j);
float expylogx = mad(tv.s0, poly, mad(tv.s1, poly, tv.s1)) + tv.s0;
float sexpylogx;
if (!__clc_fp32_subnormals_supported()) {
int explg = ((as_uint(expylogx) & EXPBITS_SP32 >> 23) - 127);
m = (23-(m + 149)) == 0 ? 1: m;
uint mantissa = ((as_uint(expylogx) & MANTBITS_SP32)|IMPBIT_SP32) >> (23-(m + 149));
sexpylogx = as_float(mantissa);
} else {
sexpylogx = expylogx * as_float(0x1 << (m + 149));
}
float sexpylogx = __clc_fp32_subnormals_supported() ? expylogx * as_float(0x1 << (m + 149)) : 0.0f;
float texpylogx = as_float(as_int(expylogx) + m2);
expylogx = m < -125 ? sexpylogx : texpylogx;